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METALLURGY EXAM 2 2024
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METALLURGY EXAM 2 2024 WITH 100% ACCURATE SOLUTIONS
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METALLURGY EXAM 2 2024 WITH 100%ACCURATE SOLUTIONS
The increase in strength observed during cold work or strain hardening is primarily due to a vast
increase in the number or amount of: - correct answer✔✔ dislocations
If we deform a metal in successive increments the yield strength will incrementally: - correct answer✔✔
increase
If a small amount of cold work produces a large increase in strength, the strain hardening coefficient, n,
would be ___. - correct answer✔✔ high
Cold work strengthening is highly effective for metals with this crystal structure: - correct answer✔✔
FCC
A flat plate of metal is cold-rolled from 1-inch thick to 1/2-inch and then further to 1/4-inch, with no
increase in width. The total amount of cold work performed is: - correct answer✔✔ 75%
Which of the following is not an asset of cold working? - correct answer✔✔ All materials can be
strengthened (metals, ceramics, polymers & composites).
Which of the following is not a correct statement regarding cold work? - correct answer✔✔ The amount
of deformation is essentially unlimited.
Cold worked components usually have ___ properties. - correct answer✔✔ anisotropic
Anisotropy and the residual stresses produced by cold working: - correct answer✔✔ may be
advantageous or detrimental
, If we heat a cold worked material into the diffusion range, the cold worked structure: - correct
answer✔✔ will change with time
During which stage of annealing are there no "optically-observable" changes to the structure, but some
properties do change? - correct answer✔✔ Recovery
During which stage of annealing are the effects of strain hardening removed and ductility restored? -
correct answer✔✔ Recrystallization
Which stage of annealing is usually considered to be undesirable? - correct answer✔✔ Grain growth
During which stage of annealing are the residual stresses produced during cold working eliminated, but
the strengthening of strain hardening is retained? - correct answer✔✔ Recovery
During which stage of annealing do dislocations move, but do not decrease in amount. - correct
answer✔✔ Recovery
During which stage of annealing are new grains nucleated and grown? - correct answer✔✔
Recrystallization
During which stage of annealing are the number or density of dislocations decreased dramatically? -
correct answer✔✔ Recrystallization
Which of the following is a correct statement regarding the joining of cold worked material? - correct
answer✔✔ To retain mechanical properties, cold worked materials should only be joined by low
temperature joining methods.
Hot working is defined as deformation performed at a temperature above: - correct answer✔✔ the
recrystallization temp
Which of the following is not a true statement about hot working? - correct answer✔✔ Surface finish
and dimensional precision are good
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